A Man Pulls a 100-N Crate Up a Frictionless 30 $\degree$

question 14

Multiple Choice

A man pulls a 100-N crate up a frictionless 30 $\degree$ slope 5 m high as shown. Assuming that the crate moves at constant speed, the work done by the man is:

• A) -500 J
• B) -250 J
• C) 0
• D) 250 J
• E) 500 J

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Definitions:

Maternal Depression

A mood disorder affecting mothers, characterized by sadness, low energy, and difficulty in bonding with their child.

Replication

The action of copying or reproducing something.

Study

The act of dedicating time and attention to acquiring knowledge or understanding through reading, practicing, or observation.

Participants

The people who are studied in a research project. Participants is the term now used in psychology; other disciplines still call these people “subjects.”